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OpenCloudOS-Kernel
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ipv6: drop some rcu_read_lock in mcast 

Similarly the code is already protected by rtnl lock.

Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WANG Cong 2014-09-11 15:35:14 -07:00 committed by David S. Miller
parent b5350916bf
commit 414b6c943f
1 changed files with 4 additions and 13 deletions
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17
net/ipv6/mcast.c
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@ -162,7 +162,6 @@ int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
mc_lst->addr = *addr;
rtnl_lock();
rcu_read_lock();
if (ifindex == 0) {
struct rt6_info *rt;
rt = rt6_lookup(net, addr, NULL, 0, 0);
@ -171,10 +170,9 @@ int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
ip6_rt_put(rt);
}
} else
dev = dev_get_by_index_rcu(net, ifindex);
dev = __dev_get_by_index(net, ifindex);
if (dev == NULL) {
rcu_read_unlock();
rtnl_unlock();
sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
return -ENODEV;
@ -192,7 +190,6 @@ int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
err = ipv6_dev_mc_inc(dev, addr);
if (err) {
rcu_read_unlock();
rtnl_unlock();
sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
return err;
@ -201,7 +198,6 @@ int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
mc_lst->next = np->ipv6_mc_list;
rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
rcu_read_unlock();
rtnl_unlock();
return 0;
@ -230,8 +226,7 @@ int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
*lnk = mc_lst->next;
rcu_read_lock();
dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
dev = __dev_get_by_index(net, mc_lst->ifindex);
if (dev != NULL) {
struct inet6_dev *idev = __in6_dev_get(dev);
@ -240,7 +235,6 @@ int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
__ipv6_dev_mc_dec(idev, &mc_lst->addr);
} else
(void) ip6_mc_leave_src(sk, mc_lst, NULL);
rcu_read_unlock();
rtnl_unlock();
atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
@ -299,8 +293,7 @@ void ipv6_sock_mc_close(struct sock *sk)
np->ipv6_mc_list = mc_lst->next;
rcu_read_lock();
dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
dev = __dev_get_by_index(net, mc_lst->ifindex);
if (dev) {
struct inet6_dev *idev = __in6_dev_get(dev);
@ -309,7 +302,6 @@ void ipv6_sock_mc_close(struct sock *sk)
__ipv6_dev_mc_dec(idev, &mc_lst->addr);
} else
(void) ip6_mc_leave_src(sk, mc_lst, NULL);
rcu_read_unlock();
atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
kfree_rcu(mc_lst, rcu);
@ -934,7 +926,7 @@ int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
struct inet6_dev *idev;
int err;
rcu_read_lock();
ASSERT_RTNL();
idev = __in6_dev_get(dev);
if (!idev)
@ -942,7 +934,6 @@ int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
else
err = __ipv6_dev_mc_dec(idev, addr);
rcu_read_unlock();
return err;
}